2161231111110 has 32 divisors (see below), whose sum is σ = 5492069648352. Its totient is φ = 542426631680.

The previous prime is 2161231111099. The next prime is 2161231111111. The reversal of 2161231111110 is 111111321612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161231111111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2118853521 + ... + 2118854540.

It is an arithmetic number, because the mean of its divisors is an integer number (171627176511).

Almost surely, 2^{2161231111110} is an apocalyptic number.

2161231111110 is an abundant number, since it is smaller than the sum of its proper divisors (3330838537242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161231111110 is a wasteful number, since it uses less digits than its factorization.

2161231111110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4237708088.

The product of its (nonzero) digits is 72, while the sum is 21.

Adding to 2161231111110 its reverse (111111321612), we get a palindrome (2272342432722).

The spelling of 2161231111110 in words is "two trillion, one hundred sixty-one billion, two hundred thirty-one million, one hundred eleven thousand, one hundred ten".